House Republicans warned a Biden administration senior energy adviser on Tuesday that they would compel him to testify if he does not comply voluntarily with their investigation into President Joe Biden’s past actions toward Ukraine.

Reps. Jim Jordan (R-OH) and James Comer (R-KY), two chairmen leading the GOP’s impeachment inquiry into Biden, told Amos Hochstein they would “resort to a compulsory process,” that is, subpoenaing him, if he continues to refuse to meet with them, according to a letter the chairmen wrote to Hochstein obtained by the Washington Examiner.

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